Agilent Technologies E3631-90002 User manual

User’s Guide
Part Number: E3631-90002
April 2000.
For Safety information, arranties, and Regulatory information,
see the pages behind the Index.
© Copyright Agilent Technologies, Inc. 2000
All Rights Reserved.
Agilent E3631A
Triple Output
DC Power Supply

The Agilent E3631A is a high performance 80 watt-triple output DC power
supply with G IB and RS-232 interfaces. The combination of bench-top and
system features in this power supply provides versatile solutions for your
design and test requirements.
Convenient bench-top features
•Triple output
•Easy-to-use knob control for voltage and current settings
•Highly visible vacuum-fluorescent display for voltage and current meters
•Tracking operation for ±25V outputs
•Excellent load and line regulation and low ripple and noise
•Operating states storage
•ortable, ruggedized case with non-skid feet
Flexible system features
•G IB (IEEE-488) and RS-232 interfaces are standard
•SC I (Standard Commands for rogrammable Instruments) compatibility
•I/O setup easily done from front-panel
Agilent E3631A
Triple Output
DC Power Supply

2
The Front Panel at a Glance
1 Meter and adjust selection keys
2Tracking enable/disable key
3Display limit key
4Recall operating state key
5Store operating state/Local key
6Error/Calibrate key
7 I/O Configuration / Secure key
8 Output On/Off key
9Control knob
10 Resolution selection keys
11 Voltage/current adjust selection key

3
1Meter and adjust selection keys Select the output voltage and current o any one
supply (+6V, +25V, or -25V output) to be monitored on the display and allow knob
adjustment o that supply.
2Tracking enable / disable key Enables / disables the track mode o ±25V supplies.
3isplay limit key Shows the voltage and current limit values on the display and
allows knob adjustment or setting limit values.
4Recall operating state key Recalls a previously stored operating state rom
location “1”, “2”, or “3”.
5Store operating state / Local key1 Stores an operating state in location “1”, “2”,
or “3” / or returns the power supply to local mode rom remote inter ace mode.
6Error / Calibrate key2 Displays error codes generated during operations, sel -test
and calibration / or enables calibration mode (the power supply must be unsecured
be ore per orming calibration).
7I/O Configuration / Secure key3 Con igures the power supply or remote
inter aces / or secure and unsecure the power supply or calibration.
8Output On/Off key Enables or disables all three power supply outputs. This key
toggles between two states.
9Control knob Increases or decreases the value o the blinking digit by turning
clockwise or counter clockwise.
10 Resolution selection keys Move the lashing digit to the right or le t.
11 Voltage/current adjust selection key Selects the knob unction to voltage control or
current control.
1The key can be used as the “Local” key when the power supply is in the remote
interface mode.
2You can enable the “calibration mode” by holding down this key when you
turn on the power supply.
3You can use it as the “Secure” or “Unsecure” key when the power supply is
in the calibration mode.

4
Front-Panel Voltage and Current Limit Settings
You can set the voltage and current limit values from the front panel
using the following method
1Press the key a ter turning on the power supply.
2Set the knob to the voltage control mode or current control mode using the
voltage/current adjust selection key.
3Move the blinking digit to the appropriate position using the resolution selection keys.
4Change the blinking digit to the desired value using the control knob.
5Press the key to enable the output. A ter about 5 seconds, the
display will go to the output monitor mode automatically to display the voltage
and current at the output.
Note All front panel keys and controls can be disabled with remote interface
commands. The Agilent 3631A must be in “Local” mode for the front panel
keys and controls to function.
Use the voltage/current adjust selection key, the resolution selection keys, and
the control knob to change the monitoring or limiting value of voltage or current
Display Limit
Output On/Off

5
Display Annunciators
Adrs Power supply is addressed to listen or talk over a remote interface.
Rmt Power supply is in remote interface mode.
+6V Displays the output voltage and current for +6V supply. Knob is active for
+6V supply.
+25V Displays the output voltage and current for +25V supply. Knob is active for
+25V supply.
-25V Displays the output voltage and current for -25V supply. Knob is active for
-25V supply.
CAL power supply is in calibration mode.
Track The outputs of +25V and -25V supplies are in track mode.
Limit The display shows the voltage and current limit value of a selected supply.
ERROR Hardware or remote interface command errors are detected and also the
error bit has not been.
OFF The three ouputs of the power supply are disabled.
Unreg The displayed output is unregulated (output is neither CV nor CC).
CV The displayed output is in constant-voltage mode.
CC The displayed output is in constant-current mode.
Toreviewthedisplayannunciators,holddown keyasyou
turn on the power supply. Display Limit

6
The Rear Panel at a Glance
Use the front-panel key to:
•Select the GPIB or RS-232 interface (see chapter 3).
•Set the GPIB bus address (see chapter 3).
•Set the RS-232 baud rate and parity (see chapter 3).
1Power-line voltage setting
2Power-line fuse-holder assembly
3AC inlet
4Power-line module
5GPIB (IEEE-488) interface connector
6RS-232 interface connector
I/O Config

7
In This Book
General Information Chapter 1 contains a general description of your
power supply. This chapter also provides instructions for checking your
power supply, connecting to ac power, and selecting power-line voltage.
Initial Operation Chapter 2 ensures that the power supply develops its
rated outputs and properly responds to operation from the front panel.
Front-Panel Operation Chapter 3 describes in detail the use of
front-panel keys and how they are used to operate the power supply from
the front panel. This chapter also shows how to configure the power supply
for the remote interface and gives a brief introduction to the calibration
features.
Remote Interface Reference Chapter 4 contains reference information
to help you program the power supply over the remote interface. This
chapter also explains how to program for status reporting.
Error Messages Chapter 5 lists the error messages that may appear as you
are working with the power supply. Each listing contains information to help
you diagnose and solve the problem.
pplication Programs Chapter 6 contains some remote interface
applications to help you develop programs for your application.
Tutorial Chapter 7 describes basic operation of linear power supplies and
gives specific details on the operation and use of the Agilent E3631A power
supplies.
Specifications Chapter 8 lists the power supply’s specifications.
If you have questions relating to the operation of the power supply, call
1-800-452-4844 in the United States, or contact your nearest Agilent
Technologies Sales Office.

8

9
Contents
Contents
Chapter 1 General Information
Safety Considerations- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15
Safety and EMC Requirements - - - - - - - - - - - - - - - - - - - - - - - - - 15
Options and Accessories - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
Options - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
Accessories- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17
Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
Initial Inspection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
Cooling and Location - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19
Input ower Requirements- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22
ower-Line Cord - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22
ower-Line Voltage Selection - - - - - - - - - - - - - - - - - - - - - - - - - - 22
Chapter 2 Initial Operation
reliminary Checkout- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27
ower-On Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 28
Output Checkout- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29
Voltage Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29
Current Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 31
Chapter 3 Front-Panel Operation
Front- anel Operation Overview - - - - - - - - - - - - - - - - - - - - - - - - - 35
Constant Voltage Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 36
Constant Current Operation- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 38
Tracking Operation- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 40
Storing and Recalling Operating States - - - - - - - - - - - - - - - - - - - - 41
Disabling the Outputs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43
Knob Locking - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43
System-Related Operations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44
Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44
Error Conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45
Display Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46
Firmware Revision Query - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47
SC I Language Version - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

Contents
10
Chapter 3 Front-Panel Operation (continued)
Remote Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - 48
Remote Interface Selection - - - - - - - - - - - - - - - - - - - - - - - - - - - - 48
G IB Address - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49
Baud Rate Selection (RS-232) - - - - - - - - - - - - - - - - - - - - - - - - - - 49
arity Selection (RS-232) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49
To Set the G IB Address - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50
To Set the Baud Rate and arity (RS-232) - - - - - - - - - - - - - - - - - 51
G IB Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53
RS-232 Interface Configuration- - - - - - - - - - - - - - - - - - - - - - - - - - - 54
RS-232 Configuration Overview - - - - - - - - - - - - - - - - - - - - - - - - - 54
RS-232 Data Frame Format - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54
Connection to a Computer or Terminal- - - - - - - - - - - - - - - - - - - 55
DTR/DSR Handshake rotocol - - - - - - - - - - - - - - - - - - - - - - - - - 56
RS-232 Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57
Calibration Overview - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 58
Calibration Security - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 58
Calibration Count - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 62
Calibration Message - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 62
Chapter 4 Remote Interface Reference
SC I Command Summary- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65
Simplified rogramming Overview- - - - - - - - - - - - - - - - - - - - - - - - 70
Using the APPLy Command - - - - - - - - - - - - - - - - - - - - - - - - - - - 70
Using the Low-Level Commands - - - - - - - - - - - - - - - - - - - - - - - - 70
Reading a Query Response- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 71
Selecting a Trigger Source - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 71
rogramming Ranges and Output Identifiers - - - - - - - - - - - - - - 72
Using the A Ly Command - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73
Output Setting and Operation Commands - - - - - - - - - - - - - - - - - - 74
Output Selection Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - 74
Measurement Commands- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 76
Output On/Off and Tracking Operation Commands - - - - - - - - - 77
Output Setting Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 77
Triggering Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 79
Trigger Source Choices - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 79
Triggering Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 81

Contents
11
Contents
Chapter 4 Remote Interface Reference (continued)
System-Related Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 82
Calibration Commands- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 85
RS-232 Interface Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87
The SC I Status Registers - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88
What is an vent Register? - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88
What is an nable Register? - - - - - - - - - - - - - - - - - - - - - - - - - - - 88
What is a Multiple Logical Output? - - - - - - - - - - - - - - - - - - - - - - 88
SC I Status System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 90
The Questionable Status Register - - - - - - - - - - - - - - - - - - - - - - - 91
The Standard Event Register - - - - - - - - - - - - - - - - - - - - - - - - - - - 93
The Status Byte Register - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94
Using Service Request (SRQ) and Serial OLL- - - - - - - - - - - - - 95
Using *STB? to Read the Status Byte - - - - - - - - - - - - - - - - - - - - 96
Using the Message Available Bit (MAV) - - - - - - - - - - - - - - - - - - 96
To Interrupt Your Bus Controller Using SRQ - - - - - - - - - - - - - - 96
To Determine When a Command Sequence is Completed- - - - 97
Using *O C to Signal When Data is in the Output Buffer - - - - 97
Status Reporting Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - 98
An Introduction to the SC I Language - - - - - - - - - - - - - - - - - - - 102
Command Format Used in This Manual - - - - - - - - - - - - - - - - - 103
Command Separators - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 104
Using the MIN and MAX parameters- - - - - - - - - - - - - - - - - - - - 104
Querying arameter Settings- - - - - - - - - - - - - - - - - - - - - - - - - - 105
SC I Command Terminators- - - - - - - - - - - - - - - - - - - - - - - - - - 105
IEEE-488.2 Common Commands - - - - - - - - - - - - - - - - - - - - - - 105
SC I arameter Types - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 106
Halting an Output in rogress - - - - - - - - - - - - - - - - - - - - - - - - - - 107
SC I Conformance Information- - - - - - - - - - - - - - - - - - - - - - - - - 108
IEEE-488 Conformance information - - - - - - - - - - - - - - - - - - - - - 111
Chapter 5 Error Messages
Execution Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 115
Self-Test Errors- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 120
Calibration Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 121

Contents
12
Chapter 6 pplication Programs
Agilent BASIC rograms - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 124
C and QuickBASIC Language rograms- - - - - - - - - - - - - - - - - - - 124
Using the A Ly Command - - - - - - - - - - - - - - - - - - - - - - - - - - - - 125
Using the Low-Level Commands - - - - - - - - - - - - - - - - - - - - - - - - 129
Using the Status Registers - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 133
RS-232 Operation Using QuickBASIC- - - - - - - - - - - - - - - - - - - - - 135
Chapter 7 Tutorial
Overview of Agilent E3631A Operation - - - - - - - - - - - - - - - - - - - 139
Output Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 141
Unregulated State - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 143
Unwanted Signals - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 143
Connecting the Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 145
Output Isolation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 145
Multiple Loads - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 145
Load Consideration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 146
Extending the Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 148
Series Connections - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 148
Remote rogramming - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 149
Reliability- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 151
Chapter 8 Specifications
erformance Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - 155
Supplemental Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - 157
Index - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -161
Declaration of Conformity - - - - - - - - - - - - - - - - - - - - - - -165

1
1
General Information

14
General Information
This chapter provides a general description of your power supply. This
chapter also contains instructions for initial inspection, location and cooling
for bench and rack operation, selecting the power-line voltage, and
connecting your power supply to ac power.

Chapter 1 General Information
Safety Considerations
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Chapter 1
General Information
Options and Accessories
16
Options and Accessories
Options
Options 0EM, 0E3,and 0E9 determine which power-line voltage is selected at
the factory. The standard unit is configured for 115 Vac ± 10%, 47-63 Hz input
voltage. For more information about changing the power-line voltage setting,
see ‘‘Power-Line Voltage Selection’’, starting on page 22 in this chapter.
Option Description
0EM 115 Vac ± 10%, 47-63 Hz input voltage
0E3 230 Vac ± 10%, 47-63 Hz input voltage
0E9 100 Vac ± 10%, 47-63 Hz input voltage
1CM Rack mount kit (Agilent part number 5062-3957)
0L2 ExtraEnglishmanualset(locallanguagemanualfilesareincluded
on the CD-ROM, Agilent part number 5964-8251.)
Accessories
The accessories listed below may be ordered from your local
Agilent Technologies Sales Office either with the power supply or separately.
Agilent No. Description
10833A GPIB cable, 1 m (3.3 ft.)
10833B GPIB cable, 2 m (6.6 ft.)
34398A RS-232, 9 pin (f) to 9 pin (f), 2.5 m (8.2 ft.) cable; plus 9 pin (m)
to 25 pin (f) adapter
34399A RS-232 adapter kit (contains 4 adapters):
9 pin (m) to 25 pin (m) for use with PC or printer
9 pin (m) to 25 pin (f) for use with PC or printer
9 pin (m) to 25 pin (m) for use with modem
9 pin (m) to 9 pin (m) for use with modem

Chapter General Information
Description
17
1
Description
The Agilent E3631A power supply features a combination of programming
capabilities and linear power supply performance that makes it ideal for
power systems applications. The triple power supply delivers 0 to ± 25 V
outputs rated at 0 to 1 A and 0 to +6 V output rated at 0 to 5 A. The ± 25V
supplies also provide 0 to ± 25 V tracking output to power operational
amplifiers and circuits requiring symmetrically balanced voltages. The 0 to
± 25V outputs track each other within ±(0.2% output + 20 mV) in the track
mode. The ± 25V outputs can also be used in series as a single 0 to 50 V/1 A
supply.
The voltage and current of each supply can be adjusted independently from
the front panel or programmed over the G IB or RS-232 interface. Using the
front panel keys and the control knob, you can adjust the voltage and
current of a selected output; enable or disable track mode; store and recall
operating states; enable or disable three outputs; calibrate the power supply
including changing the calibration security; return the power supply to local
operating mode; and configure the power supply for remote interface
operation.
From the front-panel VFD (vacuum-fluorescent display), you can monitor
actual values of output voltage and current (meter mode) or voltage and
current limit values (limit mode), check the operating status of the power
supply from the annunciators, and check the type of error from the
displayed error codes (messages).
When operated over the remote interface, the power supply can be both a
listener and a talker. Using an external controller, you can instruct the
power supply to set outputs and to send the status data back over the G IB or
RS-232. Readback capabilities include reading back output voltage and
current; present and stored status; and error messages. The following
functions are implemented over the G IB or RS-232:
• Voltage and current programming
• Voltage and current readback
• Enable or disable track mode
• resent and stored status readback
• rogramming syntax error detection
• Voltage and current calibration
• Output on or off
• Self-test

Chapter General Information
Description
18
The front panel includes a VFD for displaying the output voltage and
current. Two 4-digit voltage and current meters accurately show the actual
or limit values of a selected supply simultaneously. Three meter selection
keys choose the voltage and current of any one output to be monitored on
the display.
Connections to the power supply's output and to chassis ground are made to
binding posts on the front panel. The +25V and -25V supply's outputs share a
common output terminal which is isolated from chassis ground. The positive
and negative terminals of each output can be grounded, or each output can
be kept within ±240 Vdc from the chassis ground. The power supply is
shipped with a detachable, 3-wire grounding type power cord. The ac line
fuse is an extractor type on the rear panel.
The power supply can be calibrated from the front panel directly or with a
controller over the G IB or RS-232 interface using calibration commands.
Correction factors are stored in non-volatile memory and are used during
output programming. Calibration from the front panel or a controller
eliminates the need to remove the top cover or even the need to remove the
power supply from your system cabinet. You can guard against unauthorized
calibration by using the “Secured” calibration protection function.

Chapter General Information
Installation
19
1
Installation
Initial Inspection
When you receive your power supply, inspect it for any obvious damage that
may have occurred during shipment. If any damage is found, notify the
carrier and the nearest Agilent Sales Office immediately. Warranty information
is shown in the front of this manual.
Keep the original packing materials in case the power supply has to be
returned to Agilent Technologies in the future. If you return the power supply
for service, attach a tag identifying the owner and model number. Also include
a brief description of the problem.
Mechanical Check
This check confirms that there are no broken keys or knob, that the cabinet
and panel surfaces are free of dents and scratches, and that the display is not
scratched or cracked.
Electrical Check
Chapter 2 describes an initial operation procedure which, when successfully
completed, verifies to a high level of confidence that the power supply is
operating in accordance with its specifications. Detailed electrical
verification procedures are included in the Service Guide.
Cooling and Location
Cooling
The power supply can operate without loss of performance within the
temperature range of 0 °C to 40 °C, and with derated output current from
40 °C to 55 °C. A fan cools the power supply by drawing air through the rear
panel and exhausting it out the sides. Using an Agilent rack mount will not
impede the flow of air.
Bench Operation
Your power supply must be installed in a location that allows sufficient
space at the sides and rear of the power supply for adequate air circulation.
The rubber bumpers must be removed for rack mounting.